IPA: /ɪˌlɛkʃəˈnɪr/
KK: /ɪˈlɛkʃəˌnɪr/
To actively support or campaign for a candidate or political party during an election.
She decided to electioneer for her favorite candidate in the upcoming election.
Past: electioneered
Past Participle: electioneered
Electioneer is formed from "election" (from Latin "electio", meaning choice or selection) and "-eer" (a suffix used to denote a person associated with a particular action). The word describes a person who actively participates in the process of choosing or campaigning for candidates in an election.
Think of someone involved in the 'choice' ('electio') process — the '-eer' indicates a person, so an electioneer is someone who engages in the act of choosing.